Question detail
What is the general trend in reactivity of Group 2 metals with water as you move down the group?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Group 2, the alkaline earth metals
Question
- A. Reactivity decreases down the group.
- B. Reactivity remains the same down the group.
- C. Reactivity increases down the group.
- D. Reactivity is unpredictable down the group.
Answer
Reactivity increases down the group.
Explanation
As you move down Group 2, the reactivity of metals with water increases due to the decreasing ionisation energy, making it easier for the metals to lose electrons.
Common mistake
Misunderstanding Group 2 Metal Reactivity
Students often confuse the reactivity of Group 2 metals with non-metals, thinking they react similarly with oxygen, water, and acids.
To clarify, remember that Group 2 metals react with oxygen to form metal oxides, with water to produce hydroxides and hydrogen gas, and with acids to yield salts and hydrogen gas. For example, the reaction of magnesium with water can be represented as: 1. **Formula**: Mg + 2H2O → Mg(OH)2 + H2 2. **Substitution**: Here, magnesium reacts with water to form magnesium hydroxide and hydrogen gas. 3. **Working**: The magnesium displaces hydrogen from water, resulting in the formation of magnesium hydroxide. 4. **Answer**: The products are magnesium hydroxide (Mg(OH)2) and hydrogen gas (H2). 5. **Units/Conclusion**: This shows that Group 2 metals react with water to produce hydroxides, which is a key characteristic of their reactivity.
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